While not legally bound to refund any legitimate campaign donation, Mr. Specter has pledged to honor requests for refunds – and the requests are pouring in.

“That’s the right thing for him to do and we will request a refund,” said Sen. Lamar Alexander of Tennessee, chairman of the Senate Republican Conference. His fundraising committee, the Tenn PAC, had given $5,000.

Other Republicans who are clawing back contributions include Senate Majority Leader Mitch McConnell of Kentucky, who gave $10,000 through his Bluegrass Committee; Sen. John Cornyn of Texas, chairman of the National Republican Senatorial Committee (NRSC), who gave $5,000 through his Alamo PAC; and Sen. Bob Corker of Tennessee, who gave $5,000 through his Rock City PAC.